Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

Israel's air force achieved a "remarkable feat," said William Freer, a research fellow for national security at the U.K.-based Council on Geostrategy.

Israeli air strikes have taken out about one-third of Iran’s ballistic missile launcher capacity, though officials say it will take weeks for the threat to be fully neutralized. Meanwhile, the Pentagon is surging air assets toward the region to be forward positioned, while Israeli leaders say the...